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Tired of continuously changing your planer cutter blades? Replace your cutter head with a Byrd SHELIX spiral cutter head with 72 carbide mini blades that each offer four cutting surfaces before they need to be replaced.

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Remove four phillips head screws from each side cover. They are located behind the frame posts. The top two are near the top. Crank the cutter assembly up towards the top to get to the lower ones. After removal, crank it back down towards middle of cage assembly.

Remove one M5 x 16mm screw from the elevation sprocket using a 3mm allen wrench. Temporarily put the handwheel back on, providing leverage to unscrew screw. Once removed, the elevating shaft can be carefully pulled from the gear.

There are two washers, one behind the gear and one that goes on top of the gear before the screw is replaced. Secure the gear in place with string or tie wrap, fishing it through the shaft hole so you don't lose the gear.

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It's a good idea to clamp it to your stand or work surface before attempting to remove nut.

Place a piece of wood on the cutter assembly to lock it in place. The existing cylinder lock doesn't provide enough holding power.

Using both hands, gently work off the drive belt being careful not to pinch your fingers. Initially push down on the back side of the belt with your right hand while carefully twisting the pulley with your left. Once you get half way, move your right hand to the front of the pulley and press down. Take your time.

Using a 22mm socket wrench, holding it with both hands so you don't slip, and gently unscrew the drive nut. It only needs a short twist to break the torque then can be unscrewed the rest of the way by hand.

WARNING: The drive nut is a left-hand thread so you'll need to use the tightening setup on your wrench (turn clockwise).

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Using two flat head screwdrivers, carefully press against the bearing to work it off.

Remove the pinion gear. I put my cutter assembly in a wood vice then carefully used a small pipe wrench to unscrew the gear. It only took a little pressure to get the gear to start unscrewing. If it doesn't come off easily, try WD-40, wait a bit, then try unscrewing again.

Clean the pinion gear and screw it onto the new cutter.

Using heavy gloves, carefully insert the cutter into the housing from the drive belt side. If it doesn't slide easily into the bearing seats, use a soft head mallet to drive it in. Screw the bearing retainer onto the bearing and housing to seat the bearing properly.